Marty started a lawn mowing business. he kept track of his expenses and earnings in a table.
description amount $
lawn mower -49.99
gasoline -8.79
moyer's yard 40
griffen's yard 35.50

how much money did marty make?

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this is not the answer this is just a question. is this middle school math?

step-by-step explanation:

what is

step-by-step explanation:

70 years.

step-by-step explanation:

1,407.5 hours

step-by-step explanation:

we first convert all the time to hours and then sum them up.

there are 24 hours in 1 day, in 58 days, there are 24 x 58 = 1,392 hours.

there are 60 minutes in 1 hour, thus, 30 minutes will be equivalent to 30 / 60 = 0.5 hours.

therefore, the number of hours it will take mercury to complete a full rotation is 1,392 + 15 + 0.5 = 1,407.5 hours